两种尺度相关的动力亚网格模式对中性浮力剪切驱动的大气边界层流动的模拟比较
Comparison of Two Scale-Dependent Dynamic Subgrid-Scale Models for Simulations of Neutrally Buoyant Shear-Driven Atmospheric Boundary Layer Flows
摘要：
基于Kolmogorov尺度假设，提出了一种新的尺度相关动态亚网格尺度（SGS）模型。该SGS模式被用于一个著名的案例研究剪切驱动的中性大气边界层流动的大涡模拟。结果进行了全面的比较，与一个替代的规模依赖的动态SGS模型的基础上流行的Smagorinsky封闭。我们的研究结果表明，在这个特定问题的背景下，尺度相关的动态建模方法是非常有用的，并再现了几个建立的结果（例如，表层相似理论）。从这两个SGS基础模型的结果通常是密切一致的，虽然我们发现一个一致的优势，Smagorinsky为基础的SGS模型预测的惯性范围缩放的光谱。
英文摘要：
A new scale-dependent dynamic subgrid-scale (SGS) model based on Kolmogorov's scaling hypothesis is presented. This SGS model is utilized in large-eddy simulation of a well-known case study on shear-driven neutral atmospheric boundary layer flows. The results are compared comprehensively with an alternate scale-dependent dynamic SGS model based on the popular Smagorinsky closure. Our results show that, in the context of this particular problem, the scale-dependent dynamic modeling approach is extremely useful, and reproduces several establised results (e.g., the surface layer similarity theory) with fidelity. Results from both the SGS base models are generally in close agreement, although we find a consistent superiority of the Smagorinsky-based SGS model for predicting the inertial range scaling of spectra.
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